Viessmann VITODENS 300-W Technical Manual page 83

Control units
(cont.)
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the build-
ing to be heated.
Adjusting the heating curves matches the boiler water temperature and
the flow temperature to these operating conditions.
Heating curves:
The upper boiler water temperature is limited by the temperature limiter
and the temperature set at the electronic maximum thermostat.
The flow temperature cannot exceed the boiler water temperature.
Heating curve slope
90
80
70
60
50
40
30
20
20 15 10 5 0 -5 -10
Outside temperature in °C
Heating systems with low loss header
When using hydraulic separation (low loss header), connect a tem-
perature sensor for use in the low loss header.
Boiler water temperature sensor
The boiler water temperature sensor is connected to the control unit
and built into the boiler.
Specification
Sensor type
Permissible ambient temperature
– during operation
– during storage and transport
Cylinder temperature sensor
Standard delivery for:
■ Connection set for DHW cylinders below the boiler (120 or 150 litre)
(order separately)
■ Connection set for DHW cylinders adjacent to the boiler (160 to
400 litres) or alternative DHW cylinders (order separately)
Specification
Cable length
IP rating
Sensor type
Permissible ambient temperature
– during operation
– during storage and transport
Information regarding outside temperature sensor
The Vitodens is supplied, subject to order, with a wireless outside
temperature sensor or a hardwired outside temperature sensor:
Wireless outside temperature sensor
Wireless subscriber
Wireless, light-activated outside temperature sensor with integral wire-
less transmitter for operation with the wireless base station and the
Vitotronic control unit.
VITODENS
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-15 -20 -25 -30
Viessmann NTC, 10 kΩ at
25 °C
0 to +130 °C
–20 to +70 °C
3.75 m, fully wired
IP 32
Viessmann NTC 10 kΩ at
25 °C
0 to +90 °C
–20 to +70 °C
Installation location:
■ North or north-west facing wall of the building
■ 2 to 2.5 m above the ground, for multi storey buildings in the upper
half of the second floor
6 6
4 1
Specification
Power supply via PV cells and energy store
Radio frequency
Wireless range
IP rating
Permissible ambient temperature dur-
ing operation, storage and transport
Outside temperature sensor
Installation site:
■ North or north-western wall of the building
■ 2 to 2.5 m above the ground, for multi storey buildings in the upper
half of the second floor
Connection:
■ 2-core lead, length max. 35 m with a cross-section of 1.5 mm
per).
■ Never route this lead immediately next to 230/400 V cables
6 6
4 1
Specification
IP rating
Sensor type
Permissible ambient temperature dur-
ing operation, storage and transport
LON communication module
PCB for exchanging data with the Vitotronic 200-H, Vitocom 100, type
LAN1, Vitocom 200 and for connecting to a higher level building man-
agement system.
868.3 MHz
See "Wireless accessories"
technical guide
IP 43 to EN 60529
Ensure through design/in-
stallation
−40 to +60 °C
2 (cop-
IP 43 to EN 60529
ensure through appropriate
design/installation
7
Viessmann NTC 10 kΩ, at
25 °C
−40 to +70 °C
VIESMANN
83